chemical engineering Mcqs
3251. A good lubricant should have high _____________________ ?
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A. Pour point

B. Viscosity index

C. None of these

D. Volatility

3252. Road grade bitumen is produced from vacuum residue by its ____________________?
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A. Steam reforming

B. Pyrolysis

C. Hydrogenation

D. Aeration

3253. ______________ closure is the weakest enclosure for cylindrical vessels?
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A. Hemispherical

B. Elliptical

C. Torispherical

D. Conical or flat plate
3254. Research octane number refers to the___________________?
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A. Unleaded motor fuels

B. High octane number motor fuels

C. Low octane number motor fuels

D. High octane number aviation fuels

3255. Hydrofining is the most recent and effective method for the____________________ ?
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A. Reduction of breathing loss

B. Improvement of smoke point

C. Removal of sulphur

D. Improvement of viscosity index

3256. What is the value of q for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid ?
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A. 1

B. 0

C. 1

3257. Aniline point is a property of the__________________?
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A. LPG

B. Naphtha

C. Diesel

D. Gasoline

3258. Which of the following fractions of a crude oil will have the maximum gravity API (i.e. API) ?
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A. Vacuum gas oil

B. Gasoline

C. Diesel

D. Atmospheric gas oil
3259. Which of the following is the most widely used cracking process in oil refineries ?
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A. Dubbs process

B. Fluidised bed catalytic cracking process

C. Houdrys fixed bed process

D. T.C.C. moving bed process

3260. Which one of the following processes aims at producing higher yield of gaseous unsaturated hydrocarbons and aromatics like benzene & toluene ?
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A. Alkylation

B. Reforming

C. Hydrocracking

D. Pyrolysis

3261. In case of liquid petrofuels, momentary combustion is observed at its ________________________?
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A. Flash point

B. Flame temperature

C. Fire point

D. Preheating temperature corresponding to viscosity of 25 centistokes

3262. Waxy crudes are treated with chemical additives mainly to_________________________?
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A. Precipitate wax

B. Remove wax

C. Dissolve wax

D. Depress its pour point
3263. Tetra-ethyl lead is added in gasoline to ______________________?
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A. Increase its smoke point

B. Increase its octane number

C. Reduce gum formation

D. Reduce the pour point

3264. Paraffin base crude oil as compared to asphalt base crude gives___________________?
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A. Poorer yield of lube oil

B. Higher yield of straight run gasoline

C. Lower viscosity index lube oil

D. Higher octane number gasoline

3265. Which of the following has the lowest viscosity (at a given temperature) of all ?
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A. Lube oil

B. Diesel

C. Naphtha

D. Kerosene

3266. ________________ treatment is done for appreciable improvement in viscosity index of lubricating oil?
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A. Solvent extraction

B. Alkali

C. Acid

D. Clay

3267. Operating temperature and pressure in catalytic reforming is about_____________?
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A. 15-45 Kgf/cm2 & 450-550C

B. 5-10 kgf/cm2 & 150 250C

C. 50 75 kgf/cm2 & 600 800C

D. 1-5 Kgf/cm2 & 200C

3268. Which of the following has the highest octane number ?
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A. Naphthenes

B. Olefins

C. Aromatics

D. i-paraffins

3269. Presence of sulphur in gasoline___________________?
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A. Decreases gum formation

B. Helps during stabilisation

C. Increases lead susceptibility

D. Leads to corrosion
3270. Sweetening of petroleum product means the removal of ______________________?
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A. Wax

B. Water

C. Sulphur & its compounds

D. Organic impurities

3271. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of______________?
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A. Propane & liquid sulphur dioxide

B. Methyl ethyl ketone & glycol

C. Phenol & furfural

D. Propane & phenol-cresol mixture
3272. Most widely used solvent for dewaxing is__________________?
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A. Petroleum ether

B. Naphtha

C. Methyl-ethyl-ketone (MEK)

D. Sodium plumbite

3273. A typical yield of kerosene in straight run distillation of crude oil may be about __________________ percent?
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A. 18

B. 10

C. 26

D. 4

3274. The amount of tetraethyl lead added to improve the octane number of motor gasoline is around ______________ c.c per gallon of petrol?
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A. 300

B. 3

C. 3000

D. 1000

3275. Diesel used in naval applications has a minimum cetane number of ___________________?
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A. 35

B. 65

C. 25

D. 45
3276. Boiling range of motor gasoline is an indication of the ___________________?
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A. Vapour locking tendency

B. All A., B. and C.

C. Case of starting

D. Rate of acceleration
3277. Power required for agitation depends upon the______________________?
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A. Size of agitator & the tank

B. All A., B. and C.

C. Agitator type & speed of agitation

D. Height & properties of the liquid

3278. Natural gasoline is produced___________________?
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A. From oil wells

B. In oil refineries

C. None of these

D. By natural gas stripping
3279. In sweetening process, solutizer agent used with caustic alkali is_______________?
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A. Potassium isobutyrate

B. Methanol

C. Phenol

D. Sodium plumbite

3280. Flash point of an oil gives an idea of the___________________?
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A. Amount of low boiling fraction present

B. All A., B. and C.

C. Explosion hazards

D. Nature of boiling point diagram of the system
3281. The average boiling point of aviation turbine fuel is closest to that of__________________?
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A. Kerosene

B. Lubricating oils

C. Diesel

D. LPG

3282. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the________________?
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A. Shell side, if the flow is counter-current and tube side if the flow is co-current

B. Shell side for large overall heat transfer co-efficient

C. Shell side for smaller total pressure drop

D. Tubes to avoid the expansion of high pressure shell construction
3283. Name the hydrocarbon having the poorest oxidation stability ?
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A. Aromatics

B. Naphthene

C. Olefin

D. Paraffin

3284. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is ________________?
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A. More than 100

B. Less than 25

C. Round about 100

D. Between 50 and 100

3285. Casing head gasoline is the liquid __________________?
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A. Natural gas

B. Butane

C. Propane

D. Gasoline separated from wet natural gas by compression

3286. ______________ converts n-paraffins to i-paraffins ?
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A. Isomerisation

B. None of these

C. Polymerisation

D. Alkylation

3287. _____________ determination is not a very significant and important test for gasoline?
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A. Gum & sulphur content

B. Viscosity

C. Octane number

D. Reid vapor pressure

3288. Paraffins are desirable in lubricating oil, as it has got high_____________________?
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A. Pour point

B. Viscosity index

C. Smoke point

D. Viscosity

3289. Which of the following gasoline (unleaded) has the least octane number ?
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A. Straight run gasoline

B. Catalytically reformed gasoline

C. Catalytically cracked gasoline

D. Polymer gasoline

3290. LSHS is a type of furnace oil, which_____________________?
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A. Is more viscous than high viscosity furnace oil (HVFO)

B. Is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%)

C. All A., B. and C.

D. Stands for low sulphur heavy stock

3291. Which one is preferred for aircraft engine ?
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A. High freezing point aviation fuel

B. Low viscosity index lube oil

C. None of these

D. High viscosity index lube oil
3292. Water content in the crude oil as it comes out of oil well may be upto ______________ percent?
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A. 25

B. 5

C. 10

D. 2

3293. Petroleum coke is used mainly in the __________________ ?
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A. Manufacture of carbon electrode

B. Discoloration of yellow glycerine

C. Sugar refining

D. Blast furnace for reduction of iron ore

3294. Flash point of an oil is determined by the _____________________?
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A. Pensky Martens apparatus

B. Conradson apparatus

C. Ramsbottom apparatus

D. Saybolt viscometer

3295. Octane numbers of motor gasoline used in India and America are respectively________________?
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A. 94 & 100

B. 94 & 87

C. 83 & 100

D. 87 & 94
3296. The solvent used in Barisol dewaxing process is_____________________?
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A. Benzol and ethylene dichloride

B. Hexane

C. Furfural

D. Methyl ethyl ketone (MEK)

3297. Which of the following is used as a catalyst in fluidised bed catalytic cracking ?
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A. All A., B. and C.

B. Bentonite clays

C. Silica-alumina

D. Silica-magnesia

3298. Aniline point of the diesel is a measure of its ______________ content?
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A. Paraffin

B. Aromatic

C. Olefin

D. Naphthene

3299. Which of the following has the lowest flash point of all ?
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A. Diesel

B. Furnace oil

C. Kerosene

D. Petrol
3300. Solvent used in Edeleanu process is__________________?
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A. Propane

B. Furfural

C. Liquid SO2

D. Phenol